Pawl-and-ratchet mechanism.



M. w. GILMARTIN & M. WOGAN.

PAwL AND RATcHEr MECH/msm APPLICATION FILED JULYZI. 1914- I I Patented Apr. 4,1916.

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PAwL ANU RATCHET MECH/mmm.

APPLICATION FILED IULYZI. 1914. 1,1,395, ,Patented Apr. 4, i916.

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IVI. W. GILMARTIN & M. WOGAN.

PAWLAND RATCHET MECHANISM.

APPLICATION HLED JULY 21| i914. 1,178,395, Patented Apr. 4, 1916.

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ttomm I MICHAEL W. GIIMARTIN AND MICHAEL WOGAN, OF PHILADELPHLA, PENNSYLVANIA.

l BAWL-ANDLRATCHET` MECHANSM.

tion being to provide means for controlling Y the pawl and ratchet mechanism so as to hold the same against retrograde rotation and to release the pawl and ratchetV mechanism when it is desired to operate the same, the invention consisting in the construction,

- combination and arrangement 'of devices hereinafter described and claimed.

In the accompanying drawings :-Figure liris a side elevation of a vpawl and ratchet mechanism constructed in accordance with our invention, showing the same arranged for use in a dump wagon having a pivoted bottom, the dump wagon and thewinding shaft of the pawl and ratchet mechanism being shown in section. Fig. 2 is a vertical longitudinal sectional view of the same. vFig. Sisa `plan of the same with one side wall of the wagon bedindicated in section.

Fig. 4 is a vertical transverse sectional view on the plane indicated by the line 4-4 oi Fig. 2. Fig. V5 is a detail elevation, partly in section, of the weight lever for controlling the detent. Fig. 6 is a vertical transverse sectional view on the plane indicated by the line 6e-6 ofFig. 2. Fig. 7 is an end elevation ofthe carrier, the dog and the guide in which they aremounted. Fig. 8 is a detail perspective view of the dog. Fig. 9 is a similar view of the detent. Fig. 10 is a similar view of the carrier. Fig. 11 is a similar view of the weight lever. Fig. 12 is `a'vertical longitudinal sectional view of a `modiiedform of our invention. Fig. 13`

is a similar View of another modified form of our invention. Fig. 14 is a similar view of. another modified form of our invention.

Referring especially to the form of the invention shown in Figs. 1-2-3 and for the purposes of this specification, a winding shaft 1 for rwinding a chain to raise the hinged bottom .2 of a dump wagon such as is shown Specification of Letters Patent.

Patented Api'. 4, 1916.

VApplication filed. .T lily 21, 1914. Serial No. 852,229.

at 3, is provided with a ratchet wheel 4 which is keyed or otherwise securely fas tened thereto. -A lever 5, to be operated manually, is pivotally mounted on the winding shaft and is provided with a pawl 6 which is pivoted `at 7, the shaft being also provided with a hand grip 8 for operating the pawl and a rod 9 which connects the hand grip to a rearwardly extending arm 10 with which the pawl is provided. A coiled spring 11 is arranged on the rod 9 and one endof said spring bears against an arm of Y a guide 12,l the other end of the spring bearwagon we would have it understood that 'the vpaw'l 4and ratchet mechanism may be used for various other purposes and we would not desire to be limited in this particular.

Our invention relates especially to controlling mechanism for the pawl and ratchet mechanism to coactwith the ratchet wheel to lock the latter against retrograde rotation and to release it when it is desired to operlate the same by means of the lever and paw In the embodiment of our invention we provide a guide 14'which is arranged with one end open and opposed to one side of the ratchet wheel, the opposite end of the guide being closed as at 15. The guide is provided with a removable top 16 which has a longitudinal slot 17 at its front end. In the bottom of the guide at a suitable distance from its front end is a slot 18. Slots 19 are in the side walls ofthe guide. The guide is here shown as secured to the wall 3 of a dumping wagon by means of angle iron brackets 20.

A carrier 21 is arranged for longitudinal movement in the guide and isprovided with a'forwardly extending and open slot 22 and also with a rearwardly extending and open slot 23. A dog 24, for engaging the ratchet wheel and to hold the latter against reverse rotation is provided at its rear end with a semi-circular lug which is arranged in the slot 22 and is pivoted on a pin26 which passes through openings 27 at opposite sides of the slot 22. The dog is hence pivotally connected to the carriervand for longitudinal movement therewith and the dog is arranged in the front end of the guide as shownin Fig. 2. To facilitate the ready disengagement of the dog from the teeth of the ratchet wheel the front end of the dog has a bevel 28 on its upper side. A detent 29 is arranged in the slot 23 of the carrier and for engagement with the slot 18. A rock shaft 30 is pivotally mounted in the openings 31 in the walls of the carrier 2l, oper- Y ates in the slots 19 and one end of said rock lshaft projects from one side of the guide. The detent 29 is keyed to the rock shaft for operation thereby.

A lever 31 is pivotally mounted on the projecting end of the rock shaft and is pro- ,vided at its free end with a weight 32. At

its pivotal end the said lever is provided with a quarter circular slot 33. A set screw 34 is secured to the rock shaft and operates in the slot 33 so that the weight lever is connected to the rock shaft to turn therewith and is adapted to move vertically, inde-V Y 143 it serves to hold the detent engaged with the rear end of the slot 18 thus locking `the carrier in the guide and causing the carrier to hold the dog 28 engaged with a tooth of the ratchet wheel. Hence the latter and the winding shaft cannot turn reversely. f the wagon jolts the weight lever will merely play up and down independently of the rockrshaft 30 and the detent 29, the slot 23 permitting this. When it is desired to disengage the' detent 24 from the ratchet wheel, to enable the shaft 1 to turn and pay out the chain or for other reason, the operator with his foot turns the weight lever rearwardly and as the same swings rearwardly over the rock shaft the weight lever partly turns the latter and causes the detent to -disengage the slot 18, thereby releasing the carrier 21 and the carrier by its own gravity moves downwardly and outwardly in the inclined guide and hence disengages the dog from the ratchet wheel.

In the form of our invention shown in Fig.- 12 the carrier 21a to the front end of which the dog A24a is pivotally connected is provided near its rear end with a quadrantshaped opening 35 having a vertical rear side 36 and a substantially horizontal botwardly the detent by bearing 'against the.,

rear side 36 of the opening 33 moves the carrier rearwardly and thus disengages the dog from the ratchet wheel. VThe dog is supported clear to its free end during its engagement with the ratchet wheel.

In the Ymodified form Vof our invention shown` in Fig. 13 the carrier 2lb is provided with an opening 38 in which is an eccentric cam 29,b which is keyed to the rockshaft 30?. This rock shaft is providedwith a weight vlever such as hereinbeforedescribed. A dog 24b for engagement with. the ratchet wheel 4b is pivotally connected to the Vfront end of this carrier. By turning the weight lever forwardly the eccentric cam moves the carrier forwardly and causes the'latter to engage the dog Vwith the ratchet wheel by turning the weight. VBy turning the weight Y lever rearwardly .the eccentric cam moves the carrier rearwardly to disengage the dog as will be understood. I Y

In the form .of our invention Vshown in Fig. 14 the carrier comprises a'pair of toggle ointed links 39-40 which are pivotally connected together as at 41. The front end i of the link39 is pivotally .connected as at 42 to the rear end of the dog 24. Therear end of the link 40 is pivotally connected to the guide 143 as at 43.Y The link 39 has an enlarged rear end 44. A detent/45 for en` gaging the enlarged Vend of said link is prvotally mounted as at 46 'on the upper side of the guide and has a rearwardly VeX-V tending rock arm 47 Vwhich has a slot 48.

A link 49 operates in openings() in the Y top and bottom of the guide, .passesonfoneV side ofthe link40'and has a tappet 51 for engaging said link 40.V A pedal lever 52 is pivoted as at 53 and has a slot 54,` at'its iis rear end in which operates a pivot pin'55f which projects from the rear end of theV link 49. A weight lever on the pivot shaft 43 of the link 40 normally extends the Vtoggle jointed links to cause themrto engage the dogs 24c with the Vratchet wheel 4. VW hen Y thus arranged the detent 45`bears onV the enlarged rear end of the link 39. When the operator depresses the pedal lever itsirear-V wardlv extending arm Vmoves the link 49l upwardly thus through the instrumentality of the rock arm 47 disengaging the detent from the rear end of the link 39 of the joint .and at the same time the tappet 51 of the link 49 strikes under the link 40 thus moving the pivotally connected end of the links 39-10 upwardly and hence causing them to retract the dog 34 and disengage the same from the ratchet wheel.

Having thus described our invention, we claim 1. In mechanism of the class described, in combination with a ratchet wheel, a carrier, a fixed sunoort in which thecarrier is slidably mounted for movement toward and from the ratchet wheel, a dog nivotally mounted on the carrier and movable therewith for engagement with and disengagement from the ratchet wheel, and means to secure the carrier against movement when the dog is in engaged position.

2. In mechanism of the class described, in combination with a ratchet wheel, a carrier, a Xed support in which the carrier is slidably mounted for movement toward and from the ratchet wheel, a dog pivotally mounted on the carrier and movable therewith for engagement with and disengagement from the ratchet wheel, and means to secure and also to actuate the carrier.

3. Ratchet wheel controlling mechanism of the class described comprising a fixed guide, a carrier mounted for longitudinal movement on the guide, a dog pivotally connected to the carrier for angular movement and also for movement therewith, an angularly movable detent element mounted in the carrier to move and secure the same and a weight lever on the pivot element of said detent.

4. Ratchet Wheel controlling mechanism of the class described comprising a flXed guide, a carrier mounted for longitudinal movement on the guide, a dog pivotally connected to the carrier for angular movement and also for movement therewith, an angularly movable detent element mounted in the carrier to move the same and a weight lever on the pivot element of said detent and free to move independently thereon to a limited extent. Y

In testimony whereof we affix our signatures in presence of two witnesses.

MICHAEL W. GILMARTIN. MICHAEL VVOGAN.

lVitnes'ses:

HELEN G. DALEY, NORMAN J. SMITH.

Copies of thispatent may be obtained for ve cents each, by addressing the Commissioner of Patents,

` Washington, D. C. 

